Sigma 14mm f / 1.8 DG HSM Art Lens for Canon The world's first and only F1.8 ultra wide angle When shooting the starry sky at night, or on the coast with a broad perspective, a lens with a large front lens diameter and very useful, as it allows one to capture a moving subject by adjusting the shutter speed without referring to ISO sensitivity . With its full frame coverage, 14mm ultra-wide angle and high brightness 1.8, SIGMA 14mm F1.8 DG HSM Art really is the goal that many photographers have been waiting for. Although some zoom lenses are available that can cover 14mm, the high F1.8 brightness of a storefront diameter provides a unique advantage. By being able to use fast shutter speeds, this lens can capture a swarm of fireflies in razor-sharp quality, and with a beautiful bokeh effect and excellent control of light reflexes.